foreign key references laravel code example
Example 1: laravel migration foreign key 5.6
Schema::table('posts', function (Blueprint $table) {
$table->unsignedInteger('user_id');
$table->foreign('user_id')->references('id')->on('users');
});
Example 2: foreign key string laravel
Schema::table('portfolios', function (Blueprint $table) {
$table->string('filter_alias');
$table->foreign('filter_alias')->cascadeOnDelete()->references('alias')->on('filters');
});